Typewriting machine



Dec. 15,1936. R, M PETRIN. 2,064,177

TYPEWRITING MACHINE Filed Dec. 6,1935

Patented Dec. 15, 1936 UNITED STATES PAT TYPEWR ITING MACHINE. RemoWalter Petrini, Hartford, Conn, assignor to Royal Typewriter Company,Inc.,' New N. Y., a corporation of New York 7 York,

Application December 6, 1935 Serial No. 53,236

9 Claims.

This invention relates to new and useful improvements in typewritingmachines generally, although more particularly to a column stop unit andto the method of assembling the same.

The Myers and Handley Patent 1,926,165, Sept. 12, 1933, discloses acolumn stop unit wherein, should one of the stops become broken due toimpact of said stop against the stop lever, it is necessary to firstremove one end plate and then remove the stops until the broken stop isreached, before said broken stop can be removed and a new onesubstituted.

The principal object of the present invention is to provide a columnstop unit wherein all of the stops are mounted for individual removalwhereby should any stop become broken it can be readily removed and anew stop substituted.

Another important object of the invention is to provide removable meansfor preventingthe accidental removal of any of said columnstops. Afurther object of the invention is to provide a novel method ofassembling the unit.

In the drawing: Figure l is a top plan view of a marginstop unitconstructed in accordance with my invention,

Figure 2 is a view partly in front elevation and partly in section ofsaid unit,

Figure 3 is a cross-sectional view taken on the line 3-3 of Figure 2,

Figure 4 is a cross-sectional view showing the first step in assemblingone of the margin stops on the supporting frame, V j I a Figure 5 is anenlarged sectional view similar to Figure 3, but showing the limitingstop removed,

Figure 6 is an enlarged rear elevationofthe unit showing particularlyone of the intermediate tie plates for the frame rack bars, and also athe means of attaching one of the limiting or stop 1 plates to the upperrack bar,

Figure '7 is a cross-sectional view taken on the line 1-1 of Figure 6, t

Figure 8 is a view similar to Figure 6 but showing the column stoppartially removed, Figure 9 is a perspective view showing tion of theupper rack bar,

Figure 10 isa perspective View showing one en of one of the limitingstop plates, and

Figure 11 is a cross-sectional view showing the initial step inassembling the rack bars and intermediate tie plates.

Referring to the accompanying drawing, A designates a column stop framewhich is remova' porably mounted on the end plates 5, 5 of a typewritercarriage. This frame includes a pair of spaced upper and lower rack bars6, 1 which are rigidly connected together at their ends by end plates 8,8, and screws 9 which pass through the plates'into threaded openings inthe ends of the bars. .Rigidly connected toeach plate 8 is an outwardlyprojecting threaded stud H) which is clamped to the adjacent end plate 5of the carriage by nuts H. The frame A is held against turning bybrackets which, as shown in Figures 1, 2, and 3, are secured to the endplates 5 of the carriage and to the frame. The rack bars 6, I arerectangular in cross-section except that the top surface l2 ofthe upperbar is transversely rounded throughout its length. [The lower face ofthe upper bar and the upper face of the lower .bar are respectivelyformed with grooves l3 and. M arranged in opposed pairs and spaced apartdistances corresponding to letter space intervals. These bars are heldagainst spreading actionsbetween their ends, by intermediate tie platesl5. Each tie plate is formed with spaced openings ;l. 6,. llto'receivethe rack bars 6', 1 respectively, feachjopening being of alarger cross-sectional area than the associated rack bar. The uppersurface 12 of the upper rack bar 6 and the lower surface [8 of the lowerrack bar I, are formed with transverse seats 19, 20 for receiving theupper and'lower cross bars 2|, 22 of the tie plates to thereby interlocksaid tie plates with the rack .bars. I f Supported onthe frame A is aseries'of column stops B, there being one of these stops for each pairof upper and lower grooves l3, l4, and

therefore these stops are located at letter space intervals.- Each-stopis of H-shaped construc- .tion and includes spaced and upwardlyconverging? frontand rear arms 23, 24, spaced and down'w ardly extendingshort front and rear legs 25, 26,"and.a cross bar or connecting portion21. 3 Each] stop B is vvpositioned on the frame A so that the arms 23,24 are disposed on opposite sides'of the upper rack bar 6 and the legs25, 26 are disposed on opposite sides of the lower rack bar 1, 'thecross bar 21 extending between the "bars 6, l and into the upper andlower transverse igroove's l3, l4 thereof. The upper. ends of the arms23, 24 are rounded and the distance between these ends is a triflegreater than the width of the upper rack bar. 6 so as to permit the stopto swing froman inactiveforwardposition to an active; rearward positionor vice versa, the rounded ends constituting pivots or fulcra for ;,thestop. The le'gs 25, 26 are spaced apart a distance considerably greaterthan the width of the lower rack bar I so as to permit the stop beingswung from one extreme position to the other, the legs cooperating withsaid rack bar to limit the swinging movement of the stop. The lower edgeof the bridge portion 21 adjacent the rear leg 26 is angled and isprovided with a flat 28 which rests on the bottom wall 14* of the groovel when the stop B isin its inactive or inoperative position. The loweredge of the bridge portion 21 between the front leg 25 and the fiat 28is formed with a recess 29 to form a clearance and thereby permit thefree rearward swinging of the stop B. The stop is retained frictionallyin each of its extreme .positions, and to this end the stop is providedwith a spring 30 which is in the form of a spring wire bent between itsends to form upper and lower spring arms 31, 32 respectively, the bendof the spring engaging a headed stud 33 which is attached to the righthand face of the stop. The arms 3|, 32 extend forwardly "between theupperrandlower rack bars 5, I and'the free end of the lower arm 32 isrebent as at 34 to engage the front edge of the stop directly above andrest upon a shoulder 35 formed on said stop. The free end of the upperarm 31 is curved upwardly and downwardly to form a cam which has slidingengagement with the lower face of the upper rack bar '6 when the stop isin its active position, and with the lower front corner of the upperrack bar when the stop is in its inactive position. Thus, the stop B iscapable of being rocked rearwardly to an active position or forwardly toan inactive position, and yieldable means are provided for automaticallyand frictionally retaining the stop in either of its extreme fpositions.

It will be noted'that the distance between the top wall 13 of eachgroove I3 and the upper edge of the bridge '21 of 'thela'ssociat'edstop, is considerably greater than the length of the legs 25, 26 of thestop. Consequently, each stop can be readily removed from the frame A"by'first raising the stop bodily against the tension of the associatedspring 33, and then by swinging the stop either forwardly or 'rearwardlyto disengage the same from the frame. .In assembling the unit, each stopB -is first positioned "as in Figure 4 with the arms 23,,24 embracingthe upper rack bar 6, and with pressure being exerted on the stopagainst the tension of the spring 38. The stop is then swung rearwardlyto a position between "the rack bars 6, "I, and then released, as showninFigure 3.

In order to prevent accidental removal of the column stop B, adisplaceable limiting stop C is attached by screws 31 to the top surface12 of the upper rack bar '6. This limiting stop'C is in the nature of anelongated plate which is transversely curved, and the"longitudinal.edgesof the plate are disposed in the path of the upward movement of thecolumn stops B, and function to prevent said stops being raisedsufficiently to allow the stops toberemoved. When it is desired toreplace any broken column stop, the limiting stop C is first displaced,the broken column stop is then removed in the manner above described, anew column stop is then applied, and the limiting stop C is thenrepositioned.

The method employed in assembling the unit is as follows: The upper andlower rack bars are first projected through the openings of the tieplates IS; the rack bars are then spread apart and the tie plates arethen engaged in the transverse seats I9, 20 of the bars; the end plates8, 8 are then con'nected'to the'bars while the bars are held in theirspread relation; the column stops B, are then applied to the frame, andfinally the limiting stop 0 is attached to the upper rack bar 6.

I claim:

1. In a column stop unit for typewriting and like machines, thecombination of a frame including a pair of rack bars arranged in a fixedand parallel relation and having their inner faces provided with opposedpairs of transverse grooves arranged at spaced intervals, and aplurality of column stops individually mounted for removal in therespective opposed pairs of grooves of the rackbars, said stops beingtransversely swingable from aninactive to an active position and viceversa.

2. In a column stop unit for typewriting and like machines, thecombination of a frame including a pair of rack bars arranged in a fixedand parallel relation and having their inner faces provided with opposedpairs of transverse grooves arranged at spaced intervals, a plurality ofcolumn stops individually mounted for removal'in the respective opposedpairs of grooves of the rack bars, and yieldable means cooperating witheach stop and one bar for yieldably retaining the stop against the otherbar, said stop being bodily movable towards the first bar andtransversely swingable to a disengaged position with respect to theframe.

3. In a column stop unit for typewriting and like machines, thecombination of a frame including a pair of rack bars arranged in'a fixedand parallel relation and having their inner faces provided with opposedpairs of transverse-grooves arranged at spaced intervals, a plurality ofcolumn stops individually mounted for removal in the respectiveopposedpairs of grooves of the rack bars, said stops being transverselyswingable from an inactive to an active position and vice versa, andyieldable means cooperating with each stop and one bar for yieldablyretaining the stop against the other bar, said stop being bodily movabletowards the first bar and transversely swingable to a disengagedposition with respect to the frame.

4. In a column stop unit for typewriting and like machines, thecombination of a frame includ- "ing a pair of rack bars arranged in afixed and parallel relation and having their inner faces provided withopposed pairs of transverse grooves arranged at spaced inteiwalsfand aplurality of column stops individually mounted for removal in therespective opposed -pairs of grooves of the rackbars,each'stopcomprising spacedarms embracing the upper rack bar andhaving pivotal engagement 'therewith,' spaced legs embracing the lowerrack bar and cooperating with the bar to limit the swinging movements ofthe stop, and a bridge connecting the arms and legs and disposed betweenthe bars and slida'bly engaging in the upp'er'and lower 'grooves of thebars, and a spring mounted on each stop for-cooperation with the upperbar for frictionally retaining the stop against the lower bar in eitherextreme position of movement of the stop, the distance "between theupper edgeof the bridge and the top "w'aIl offthe associated uppergroove being con- .siderably greater than the length of the legs wherebysaid stop can be raised bodily against the tension ofthe spring andthen-swung transversely of the frame to a disengagedposition withrespect to the latter.

5; In a column stop unitfor typewriting and like machines, "the"combination of'a 'frame-including a pair of rack bars arranged in afixed and parallel relation and having their inner faces provided withopposed pairs of transverse grooves arranged at spaced intervals, aplurality of column stops individually mounted for removal in therespective opposed pairs of grooves of the rack bars, said stops beingtransversely movable from an inactive position to an active position andvice versa, and a displaceable limiting stop mounted on one of the barsfor cooperation with a plurality of column stops to normally prevent thelatter from becoming accidentally removed.

6. In a column stop unit for typewriting and like machines, thecombination of a frame including a pair of rack bars arranged ina fixedand parallel relation and having their inner faces provided with opposedpairs of transverse grooves arranged at spaced intervals, a plurality ofcolumn stops individually mounted for removal in the respective opposedpairs of grooves of the rack bars, yieldable means cooperating with eachstop and one bar for yieldably retaining the stop against the other bar,said stop being bodily movable towards the first bar and transverselyswingable to a disengaged position with respect to the frame, and adisplaceable limiting stop mounted on one of the bars for cooperationwith a plurality of column stops to normally prevent the latter frombecoming accidentally removed.

'7. In a column stop unit for typewriting and like machines, thecombination of a frame including a pair of rack bars arranged in a fixedand parallel relation and having their inner faces provided with opposedpairs of transverse grooves arranged at spaced intervals, and aplurality of column stops individually mounted for removal in therespective opposed pairs of grooves of the rack bars, each stopcomprising spaced arms embracing the upper rack bar and having pivotalengagement therewith, spaced legs embracing the lower rack bar andcooperating with the bar to limit the swinging movements of the stop,and a bridge connecting the arms and legs and disposed between the barsand slidably engaging in the upper and lower grooves of the bars, aspring mounted on each stop for cooperation with the upper bar forfrictionally retaining the stop against the lower bar in either extremeposition of movement of the stop, the distance between the upper edge ofthe bridge and the top wall of the associated upper groove beingconsiderably V greater than the length of the legs whereby said to thelatter, and a displaceable limiting stop mounted on the upper rack barfor cooperation with a plurality of column stops to normally prevent thelatter from becoming accidentally removed.

8. In a column stop unit for typewriting and like machines, thecombination of a frame including a pair of rack bars arranged in a fixedand parallel relation and having their inner faces provided with opposedpairs of transverse grooves arranged at spaced intervals, and aplurality of column stops individually mounted for removal in therespective opposed pairs of grooves of the rack bars, each stopcomprising spaced arms embracing the upper rack bar and having pivotalengagement therewith, spaced legs embracing the lower rack bar andcooperating with the bar to limit the swinging movements of the stop,and a bridge connecting the arms and legs and disposed between the barsand slidably engaging in the upper and lower grooves of the bars, aspring mounted on each stop for cooperation with the upper bar forfrictionally retaining the stop against the lower bar in either extremeposition of movement of the stop, the distance between the upper edge ofthe bridge and the top wall of the associated upper groove beingconsiderably greater than the length of the legs whereby said stop canbe raised bodily against the tension of the spring and then swungtransversely of the frame to a disengaged position with respect to thelatter, and a displaceable limiting stop mounted on the upper rack barfor cooperation with a plurality of column stops to normally prevent thelatter from becoming accidentally removed, said limiting stop comprisinga plate extending longitudinallypof the frame and attached to the uppersurface of the upper rack bar, the longitudinal edges of the platecooperating with the upper ends of the arms of the column stop to limitthe upward movement of the latter. 9. In a column stop unit fortypewriting and like machines, the combination of a frame including apair of rack bars arranged in spaced parallel relation and with thetransverse grooves thereof disposed opposite each other, end platessecured to the ends of the bars, column stops mounted in the grooves ofthe bars and movable transversely of the bars from an inactive to anactive position and vice versa, said bars having transverse seats formedin their outer faces, and a tie plate connecting the bars and havinginterlocking engagement in said seats.

REMO WALTER PETRINI.

